The top 8 companies from Y Combinator W17 Demo Day 2

3D printing factories, machine learning APIs, and electric planes made our list of the most high-potential startups out of the 51 that presented at Y Combinator’s Winter 2017 Demo Day 2. We asked the top Silicon Valley investors and conferred with the TechCrunch team to pick these 8 companies. But there were plenty more startups with big opportunities from this batch of backend engineering, hard science, and enterprise products.